Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 135 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/getcwd.c b/REORG.TODO/sysdeps/unix/sysv/linux/getcwd.c
new file mode 100644
index 0000000000..3b556fd450
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/sysv/linux/getcwd.c
@@ -0,0 +1,135 @@
+/* Determine current working directory.  Linux version.
+   Copyright (C) 1997-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <assert.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/param.h>
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+
+
+/* If we compile the file for use in ld.so we don't need the feature
+   that getcwd() allocates the buffers itself.  */
+#if IS_IN (rtld)
+# define NO_ALLOCATION	1
+#endif
+
+
+/* The "proc" filesystem provides an easy method to retrieve the value.
+   For each process, the corresponding directory contains a symbolic link
+   named `cwd'.  Reading the content of this link immediate gives us the
+   information.  But we have to take care for systems which do not have
+   the proc filesystem mounted.  Use the POSIX implementation in this case.  */
+static char *generic_getcwd (char *buf, size_t size) internal_function;
+
+char *
+__getcwd (char *buf, size_t size)
+{
+  char *path;
+  char *result;
+
+#ifndef NO_ALLOCATION
+  size_t alloc_size = size;
+  if (size == 0)
+    {
+      if (buf != NULL)
+	{
+	  __set_errno (EINVAL);
+	  return NULL;
+	}
+
+      alloc_size = MAX (PATH_MAX, __getpagesize ());
+    }
+
+  if (buf == NULL)
+    {
+      path = malloc (alloc_size);
+      if (path == NULL)
+	return NULL;
+    }
+  else
+#else
+# define alloc_size size
+#endif
+    path = buf;
+
+  int retval;
+
+  retval = INLINE_SYSCALL (getcwd, 2, path, alloc_size);
+  if (retval >= 0)
+    {
+#ifndef NO_ALLOCATION
+      if (buf == NULL && size == 0)
+	/* Ensure that the buffer is only as large as necessary.  */
+	buf = realloc (path, (size_t) retval);
+
+      if (buf == NULL)
+	/* Either buf was NULL all along, or `realloc' failed but
+	   we still have the original string.  */
+	buf = path;
+#endif
+
+      return buf;
+    }
+
+  /* The system call cannot handle paths longer than a page.
+     Neither can the magic symlink in /proc/self.  Just use the
+     generic implementation right away.  */
+  if (errno == ENAMETOOLONG)
+    {
+#ifndef NO_ALLOCATION
+      if (buf == NULL && size == 0)
+	{
+	  free (path);
+	  path = NULL;
+	}
+#endif
+
+      result = generic_getcwd (path, size);
+
+#ifndef NO_ALLOCATION
+      if (result == NULL && buf == NULL && size != 0)
+	free (path);
+#endif
+
+      return result;
+    }
+
+  /* It should never happen that the `getcwd' syscall failed because
+     the buffer is too small if we allocated the buffer ourselves
+     large enough.  */
+  assert (errno != ERANGE || buf != NULL || size != 0);
+
+#ifndef NO_ALLOCATION
+  if (buf == NULL)
+    free (path);
+#endif
+
+  return NULL;
+}
+weak_alias (__getcwd, getcwd)
+
+/* Get the code for the generic version.  */
+#define GETCWD_RETURN_TYPE	static char * internal_function
+#define __getcwd		generic_getcwd
+#include <sysdeps/posix/getcwd.c>